Manufacture of rolls.



J. S. SEAMAN, Jn. MANUFACTURE OF ROLLS.

APPLICATION FILED 00130, 1912.

Patented Sept. 2, 1913.

2 SHEETS-SHEET 1.

WITNESSES! INVENTOR Atty JOSEPH s. SEAMAN, an, or PITTSBURGH, PENNSYLVANIA.

MANUFACTURE OF ROLLS.

Specification of Letters Patent.

Patented Sept. 2, 1 913.

Application filed October 30, 1912. Serial No. 728,707.

To (171 whom it may concern:

Be it known that I, Jossr'u S. SEAMAN, J12, residing at Pittsburgh, in the county of .-\llegheny and State of Immsydvania, a citizen of the United States, have invented or discovered certain new and useful Improvements in the Manufacture of Rolls, of which improvements the following is a specification.

In the manufacture of grooved rolls, such for example as are employed for rolling rails, beams, channels, and other sections, it is desirable that the metal forming the faces of the grooves should be dense so as to insure durability in use and for some passes it is desirable that the working faces should be chilled 2'. 0., dense and hard.

In order to avoid excessive cutting away of metal to form grooves in the rolls, it is customary to form grooves approximating in depth and width those desired in the finished rolls, when casting the roll. To this end the inner walls of the molds are provided at suitable intervals with annular ribs, which in some cases are formed of sand, and in some cases of metal, if chilled rolls are desired, the whole of the body of the mold including the rings are formed of metal. In the manufacture of sand rolls embodying my improvement the grooves in the rolls are formed by annular ribs or cores formed of sand and generally having their peripheries formed by a metal ring. These metal portions of the ribs are made of such a size, as to produce a quick and sullicientreduc: tion of temperature in the portions of the cast metal adjacent to the ribs, soas to in-- crease the density of the castiron, but as these metal portions of the ribs are small relative to the mass of molten cast iron and as radiation is prevented by the sand backing, they will beheated to or approximately to that of the cast metal, whereby their cooling action will be stopped before a hardening effect is produced.

It will be understood that in making chilled rolls, the entire body portion of the mold including the groove forming ribs are formed of metal of such thickness that their cooling effect is maintained sufliciently long to not only increase the density of the ad j acent cast metal but also to render the same extremely hard. It has been found that the densifying effect in one case. and the chilling effect in the other case is 'so limited in extent that in giving the grooves the final shape and dimensions considerable portions of the dense or chilled metal is cut away.

The object of the invention described herein is to provide for an extension of the den sity and chill producing efl'ects hereinbefore referred. to.

The invention is hereinafter more fully described and claimed.

In the accompanying drawings forming a part of this specification, Figures 1 and 2 are sectional elevations respectively of sand molds and molds having chills employed in the practice of my invention; Fig. 3 is a sec tional view of a portion of my improved roll; and Fig. 4 is a sectional view showing my improved roll with the grooves cut to final shape and a collared roll used in connection therewith.

In the practice of my invention both the sand mold 1 and the chill mold 2 are constructed in the usual manner. The inner portions of the ribs 3 of the sand mold are formed by metal ring sect-ions 4 which are made of such dimensions in cross-section as to cause a quick reduction of temperature of the cast metal and to maintain such reduction sutliciently long to produce the esired density of metal adjacent to the side walls of the collars 4: and the bottoms of the passes formed by the ribs intermediate the collars. In Fig. 2 I have shown a mold formed in part of sand substantially as shown in Fig. 1 and in part by a chill ring 5. After the roll has been removed from the mold, it is placed in a lathe and the walls of the grooves 7 formed by casting are cut away to the final shape as shown at 8 in the roll 9. It will be observed that considerable metal is removed in finishing the roll, especially at the points a or inner corners of the passes, and it is at these points that the greatest wear occurs. It has been found that the densifying effect in one case and the chilling effect in the other extends in rolls made according to the present practice only a very small distance laterally and inwardly from the inner corners of thepasses and hence although the surfaces of the passes may be formed of tough dense metal when the roll is new, such dense metal will be entirely removed when the roll is re-turned. In order to cause an extension of the condensing and chilling efi'ects, rings 10 of cast iron are arranged in the molds intermediate of the,

groove forming ribs. It has been found that these rings, which'become incorporated in the rolls, will cause an increase of density of the cast metal adjacent thereto. By properly proportioning the transverse dimensions of these rings, the entire body of metal in the collars 6 will be rendered dense, and by making the internal diameter of those rings less than that of the groove forming ribs, the inward and lateral extent of dense nietal'at the corners of the groove is greatly increased. As these rings are made of the same kind of metal as the roll itself they become incorporated in the roll, which is not materially weakened by their presence.

It will be understood that although the rings 10 may not have any permanent chilling effect on the adjacent metal, they will have such an efiect as will render the chilling action of the groove-forming rings effective to a greater depth.

No claim is made herein to the roll, which has been described with more or less parovnaoa ticularity, as such roll forms the subjectmatter of another application.

I claim herein as my invention:

1. As an improvement in the art of manufacturing grooved rolls, the method herein described which consists in suddenly reducing the temperature of the molten metal adjacent to the groove-forming ribs of the mold and also reducing the temperature of the molten metal intermediate snch groove- JOSEPH S. SEAMAN, JR.

Witnesses:

T. W. ENGLAND, DARWIN S. WOLCOTT. 

